If anyone is curious on what the hulls would look like. These are the hulls from Ships from the ST:Enterprise era.
Yes, but I believe the Daedelus class that follows does have Shields. Plus they're always a goal for Starfleet and Starfleet knows they're possible. So long term our warp coil and hull plating industry is more important.Pretty sure this is what the NX-01 was notably lacking in the show.